Production Test Introduction

After device finish engineering prototypes stage, hardware engineer will need to provide test specification and pass criteria base on the product specification. Production test also could be treated as a simplified regulatlation test, because it has to fulfill standard of worldwide standard (for example: GSM) of local regulation (for example: Wi-Fi).

The target of production test, is deliver quality products. And production test won't go through all engineering details, because factory have time constriant on each station and production line also has cycle time for efficient for production.

Process flow

Major test process

PCBA level test: Target of PCBA test is make sure the surface mount quality and the main component works properly

Pre-assembly test: Usually a production will include attached modules, and connected with FPC (flexable plastic cable) or connectors, pre-assembly test will test system function with module attached

After-assembly test: After assembly is final product test, all major function need to be verified before product shipping.

Fixture Design

Fixture design base on required test item and test point location. At design time, should consider all re-quired test point in the PCB, and must easy accessable during PCBA/PCBA with module/Assembly. If test point and fixture design was bad, it will make product non-mass productionable.

Test point

Important test point during GTA production including:

Consoleuart TX/RX

GPS RF test port

GSM RF test port

Wi-Fi RF test port

Battery test point

Vibrator test point

Auto power on test point

Modem power on test point

JTAG test point

USB test point

SIM card test point

SD card test point

Earphone (also connect to Modem IR port)

Fixture

Fixture used for speed up production process, it also has life cycle and need maintance during prodction process. All the connector/test pin/plugs are expendable, and should could be fixed in time during every production process.

Every device has it's own specification and requirement, so the fixture design and requirement should base on device charactics to adjust process. Follwoing just GTA case for your reference.

For example, GTA using following test fixture during production

Initial u-boot download

GSM test

DM1 test

DM1.5 test

GPS C/N test /w shielding case

Wi-Fi test /w shielding case

Bluetooth test /w shielding case

For development process, all fixture could be integrated into 1 fixture for speed up test software development process. But integrated fixture will cost more and will have more chance get broken during production process, also, integrated fixture need attach every expensive test equipment, and make fixture duplication very non-practical because the cost of expensive test equipment. But singal/integrated test fixture DO very useful during trial run process for software verification.

Factory tend to spilt fixture into simple function and easy maintainable unit, and also could cost saving/balance production line flow process. Base on device charactics and factory process/equipment availability.

GTA02 DM2 Source Code

Process flaw

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Production Test Introduction

After device finish engineering prototypes stage, hardware engineer will need to provide test specification and pass criteria base on the product specification. Production test also could be treated as a simplified regulatlation test, because it has to fulfill standard of worldwide standard (for example: GSM) of local regulation (for example: Wi-Fi).

The target of production test, is deliver quality products. And production test won't go through all engineering details, because factory have time constriant on each station and production line also has cycle time for efficient for production.

Process flow

Major test process

PCBA level test: Target of PCBA test is make sure the surface mount quality and the main component works properly

Pre-assembly test: Usually a production will include attached modules, and connected with FPC (flexable plastic cable) or connectors, pre-assembly test will test system function with module attached

After-assembly test: After assembly is final product test, all major function need to be verified before product shipping.

Fixture Design

Fixture design base on required test item and test point location. At design time, should consider all re-quired test point in the PCB, and must easy accessable during PCBA/PCBA with module/Assembly. If test point and fixture design was bad, it will make product non-mass productionable.

Test point

Important test point during GTA production including:

Consoleuart TX/RX

GPS RF test port

GSM RF test port

Wi-Fi RF test port

Battery test point

Vibrator test point

Auto power on test point

Modem power on test point

JTAG test point

USB test point

SIM card test point

SD card test point

Earphone (also connect to Modem IR port)

Fixture

Fixture used for speed up production process, it also has life cycle and need maintance during prodction process. All the connector/test pin/plugs are expendable, and should could be fixed in time during every production process.

Every device has it's own specification and requirement, so the fixture design and requirement should base on device charactics to adjust process. Follwoing just GTA case for your reference.

For example, GTA using following test fixture during production

Initial u-boot download

GSM test

DM1 test

DM1.5 test

GPS C/N test /w shielding case

Wi-Fi test /w shielding case

Bluetooth test /w shielding case

For development process, all fixture could be integrated into 1 fixture for speed up test software development process. But integrated fixture will cost more and will have more chance get broken during production process, also, integrated fixture need attach every expensive test equipment, and make fixture duplication very non-practical because the cost of expensive test equipment. But singal/integrated test fixture DO very useful during trial run process for software verification.

Factory tend to spilt fixture into simple function and easy maintainable unit, and also could cost saving/balance production line flow process. Base on device charactics and factory process/equipment availability.